Biologically, Vengess have horns and pointed teeth. Their blood works as a sort of superconductor for heat. Otherwise, they seem to be a genetically varied species, as seen in Pedri, who has three eyes. Smoking Florem Mortem also relaxes them.

The Vengess are capable of magic, as seen in the potions Wrathia brews, and Pedri's ability to conjure dragonflies.